There is a chance that after the cut-scene the party will not automatically be in the circular chamber with The Lost and Inferno golem, i.e. be stuck outside, still in the long corridor. You cannot move into the room due to an invisible barrier at the entrance, because the event script has closed it off. The console runscript debug mode has no option to "teleport" the party into it. Solution is to initiate combat by targeting with a ranged weapon or spell. Stay in the corridor away from the golem's flame attacks and continue with spells and ranged weapons to kill The Lost first,. Then, attack the Inferno golem. If the golem comes near the doorway, use melee weapons. Once both are defeated, the event script will reopen the chamber, and you can then enter and loot the corpses.